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首页> 外文期刊>International Journal of Heat and Mass Transfer >Longitudinal drift behaviors and spatial transport efficiency for spraying pesticide droplets
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Longitudinal drift behaviors and spatial transport efficiency for spraying pesticide droplets

机译：喷涂农药液滴的纵向漂移行为和空间运输效率

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摘要

Pesticide spraying for crop protection is to obtain adequate coverage on the target surfaces with a minimum of off-target waste. Understanding the spatial behaviors of spray droplets is critical to regulate pesticide deposition. Here, we investigated the droplet interaction behaviors in the dense region and the transport efficiency of pesticide droplets in the dispersed region. The trajectories were tracked with the discrete phase method verified by the wind tunnel experiment. In the dense region near the nozzle, coalescence between droplets smaller than 150 μm and the larger ones can obviously improve the initial droplet size distribution. The reduction in the proportion of easily drifted droplets, contributed by droplet coalescence, can significantly increase droplet deposition onto the target region. When droplets are gradually dispersing, the critical drift height is proposed and clarified by recognizing the falling distance where the mass transport efficiency begins to reduce rapidly. Once the actual spray height exceeds the critical drift height, narrowing the initial relative span of droplets will not facilitate the pesticide transport efficiency, even aggravating the drift loss. The evaporation losses of droplets smaller than 150 μm are more sensitive to the air temperature and relative humidity. The findings of droplet drift behaviors offer insights into pesticide spraying and also provide a strategy for drift regulation.
机译：用于作物保护的农药喷洒是在目标表面上获得足够的覆盖率，最小余量废物。了解喷雾液滴的空间行为对于调节农药沉积至关重要。在这里，我们研究了分散区域中的致密区域中的液滴相互作用行为和农药液滴的运输效率。轨迹是用由风隧道实验验证的离散相位方法跟踪。在靠近喷嘴附近的致密区域中，液滴之间的聚结小于150μm，较大的液滴可以明显改善初始液滴尺寸分布。通过液滴聚结贡献的容易漂移液滴比例的减少可以显着增加液滴沉积到目标区域上。当液滴逐渐分散时，通过识别出质量运输效率开始迅速减少的下降距离来提出和澄清临界漂移高度。一旦实际的喷射高度超过临界漂移高度，缩小液滴的初始相对跨度将无法促进农药运输效率，甚至加重漂移损失。小于150μm的液滴的蒸发损耗对空气温度和相对湿度更敏感。液滴漂移行为的调查结果为农药喷涂提供见解，并提供了漂移调节的策略。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2021年第10期|121516.1-121516.15|共15页
  • 作者

    Shidong Xue; Xi Xi; Zhong Lan; Rongfu Wen; Supervision Writing - review editing; Xuehu Ma;

  • 作者单位

    State Key Laboratory of Fine Chemicals Liaoning Key Laboratory of Clean Utilization of Chemical Resources Institute of Chemical Engineering School of Chemical Engineering Dalian University of Technology Dalian 16024 PR China;

    State Key Laboratory of Fine Chemicals Liaoning Key Laboratory of Clean Utilization of Chemical Resources Institute of Chemical Engineering School of Chemical Engineering Dalian University of Technology Dalian 16024 PR China;

    State Key Laboratory of Fine Chemicals Liaoning Key Laboratory of Clean Utilization of Chemical Resources Institute of Chemical Engineering School of Chemical Engineering Dalian University of Technology Dalian 16024 PR China;

    State Key Laboratory of Fine Chemicals Liaoning Key Laboratory of Clean Utilization of Chemical Resources Institute of Chemical Engineering School of Chemical Engineering Dalian University of Technology Dalian 16024 PR China;

    State Key Laboratory of Fine Chemicals Liaoning Key Laboratory of Clean Utilization of Chemical Resources Institute of Chemical Engineering School of Chemical Engineering Dalian University of Technology Dalian 16024 PR China;

    State Key Laboratory of Fine Chemicals Liaoning Key Laboratory of Clean Utilization of Chemical Resources Institute of Chemical Engineering School of Chemical Engineering Dalian University of Technology Dalian 16024 PR China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Droplet interaction; Pesticide transport; Spray drift; Critical drift height; Droplet size distribution;

    机译：液滴相互作用;农药运输;喷雾漂移;临界漂移高度;液滴尺寸分布;

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